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3 Sheets -Sheet i. S. C. HUBBARD.

Dividing Engine. I No. 17,606. Y Patented June 16, i857.

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S. C. HUBBARD.

Dividing Engine.

Patented June 16, 1857 3 Sheets-Sheet 3. s. c. HUBBARD. i

i Dividing Engine. No. 17,606. Patented June 16, 1857.

UNITED STATES PATENT OFFICE.

SAMUEL C. HUBBARD, OF MIDDLETOWN CONNECTICUT, ASSIGNOR TO CHARLES C.

HUBBARD.

MACHINE FOR GRADUATING LINEAL MEASURES.

Specification of Letters Patent No. 17,606, dated June 16, 1857.

To all whom it may concern:

Be it known that I, SAMUEL C. HUBBARD, of Middletown, in the county of Middlesex and State of Connecticut, have invented certain new and useful Im rovements in Machines for Graduating ineal Measures, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which make part of the specification, and in which Figure 1 represents a side elevation of a machine having my improvements applied thereto; Fig. 2 represents a top view thereof; and Fig. 3 an elevation of one end of the same.

My improved machine is more especially designed for the graduation of folding pocket rules, and it consists of a strong frame or bed (A) with rails (a) on its top, for a carriage (B) to slide on, which carries graduated dies to imprint the divisions and numerals upon the rule. On each side of the bed frame (A) a standard (C) is erected, and these standards support the horizontal axis of a thick disk (D) whose oflice it is to press the rule upon the dies to indent the marks of the latter, upon the former in a manner to be presently described.

The carriage (B) has a reciprocating mo-' tion upon the rails or guides (a) which is communicated to it in this instance by straps (E) connected to a shaft (F) in the frame, in such manner that when the shaft (F) is turned in one direction the one strap will be unwound from the shaft and the other wound upon it; the strap at the end of the carriage which for the time is approaching the shaft being wound up, and that attached to the end of the carriage which is receding from the shaft being let out; with this arrangement it is obvious that a reciprocating motion is easily communicated to the carriage by attaching a winch (G) to the shaft, and turning it in alternately opposite directions.

A central rib (H) extends along the top of the carriage and on each side of this rib two studs (1) are placed, the dies which consist of oblong blocks of metal are placed between this central rib and the studs, and the set screws (J) which ass through the studs secure the dies firm y to the rib, and as there is a die on each side of the rib the two edges of the same rule, or one edge of each of two adjacent rules may be graduated at once by pressing the same down upon the dies. As rules of difierent widths have to be graduated the dies are set at different distances from the central rib (H) by means of set screws projecting therefrom and the set or clamp screws (J) which pass through the studs (I).

The upper faces of the dies have all the characters formed upon them in relief, which it is desired to imprint on the rule to be graduated. The top of the dies extends so near to the lowest part of the eripher of the disk that when a rule is lai upon t em to be stam ed, and the carriage moved beneath the disk, it can only pass under the latter by forcing the rule down upon the face of the die with a high degree of pressure, which insures the imprinting of the graduation marks.

As the folding pocket rule has several joints, some of whlch roject considerably above the face of the ru e, 1t becomes necessary to prevent the crushing of the joints to provide corresponding indentations in the face of the dies, and in the peri hery of the disk; and in order that these indbntations in the disk may always meet the joints of the rule, it is necessary that the disk should begin its motion in a determinate position. To insure this the side of the disk is fitted with a pin (K) which strikes against a stop (L) on the frame and is held there by the tension of a spring (M) coiled around the shaft (N) and as the disk is turned by friction alone it alwa s commences turning when the rule on the ies bears against it in passing under, in this way the position of the disk in starting with respect to the rule is always the same.

The rule represented in Fig. 4 shows the manner in which the dies graduate it, and the rule in Fig. 5 re resents additional or gage lines (a) paralle to the edges, and at right angles to the raduation marks of the rule. -These gage ines are produced b shar -pointed instruments (P) held by a brac et immediately behind the disk, so that the progressive movement of the carriage will bring the rule under those points and kslcratch or cut the lines to the requisite de t %he movements and construction of the several parts can readily be modified to a considerable extent, without changing the character of the invention in the least, but as such changes as these are quite obvious, I I have not deemed it necessary to describe them.

1. I claim in combination with dies-for imprinting the figures and transverse lines upon the rule, gravers or points, arranged and held as described, for marking the gage or longitudinal lines on the rule as de-. scribed.

2. I also claimthe pressure disk (D) with one or more indentations on its eriphery corresponding tothe knuckles 0 the joints of folding rules, when this is combined with giving to the disk thus constructed a self-acting reverse motion to bring it back after each impression of a rule, to the precise point whence it started, substantially .in themanner and for the pur ose hereinspecified.

In testimony whereof I have hereunto subscribed, my name.

i SAML. C. HUBBARD,

Witnesses: V

OHAs. W. GALPIN,

IsAAo HULL. 

